What causes the animals to run back to the window animal farm?

In George Orwell's "Animal Farm," the animals run back to the window due to their instinctual desire for freedom and the hope of a better life. They are drawn by the memories of their past and the promises of their leaders, who initially inspire them to revolt against oppression. However, as the story progresses, their hope is overshadowed by disillusionment and the realization that their new rulers are just as oppressive as the old ones. This reflects the theme of betrayal and the cyclical nature of power.